Gov Weather XML数据馈送失败

在戳了一个小时之后，我卡住了。所有被注释掉的url都可以正常工作。但是政府数据失败了。任何想法吗?

//  $url = 'http://en.wiktionary.org/w/api.php?format=json&action=query&titles=work&rvprop=content&prop=revisions&redirects=1';
$url = "http://forecast.weather.gov/MapClick.php?lat=39.1666&lon=-86.5215&unit=0&lg=english&FcstType=dwml";
//$url = 'http://www.reddit.com/r/bloomington/.rss';
//$url = "http://forecast.weather.gov/MapClick.php?lat=34.12699&lon=-118.27381&unit=0&lg=english&FcstType=dwml";
$myReadAccess=new ReadFile($url);
if(!$data=$myReadAccess->getFileContents()){
    //ERROR, DISPLAY ERROR MESSAGE
    echo "Error: " . $myReadAccess->getError();
}
else{
    //SUCCESS, DISPLAY FILE CONTENTS
    echo $data;
}

读取文件类http://pastebin.com/8pQxfsz7